This is pretty much a standard romance. Talented photographer who has been "done wrong" by a male model she fell for; meets new even handsomer male model; can't get past feeling she's being taken advantage of again. The dance of "I want to, but what if I get hurt, so I won't" leads to frustration for the guy, a long period of heavy petting and his demands that she be honest with him. And, of course, as the title implies they decide to forsake all others and be together forever.
A good read for the beach or vacation (I read it camping) because it's light, fun and predictable. Spencer creates gorgeous women characters, good-looking leading men with tons of integrity and interesting settings. This will never be great literature, but sometimes it's exactly what you want to read.